Improvement in magneto-electric machines for giving shocks



No. 5,507. PATENTED APR. 11, 1848.

I G. H. & B. H. HORN. MAGNETO ELECTRIC MACHINE FOR GIVING SHOCKS.

Winesses; 42/ M men? UNITED STATES PATENT OFFICE.

e. H. HORN, on BOSTON, MASSACHUSETTS, AND 'B. H. HORN, on NEW YORK.

= n. r; 1). o. MOORHEAD, ASSIGNEE.

IMPROVEMENT IN MAGNETO-EIQECTRIC MACHINES FOR GIVING SHOCKS.

Specifieittion forming part of Letters Patent No. 5,507, dated April 11,1848.

To all whom it may concern:

- Be it known that we," GEORGE H. HORN, of the city of Boston,Massachusetts, and BEN- JAMIN H.,HOBN, of the city of N ew Y0rk,N'.Y.,manufacturers of magneto-electric apparatus for medical and generalpurposes, have invented and made and applied to use certain new anduseful improvements in the construct ive arrangement ofthe parts used toform, reg; ulate, and break the circuit of the electrical current inmagneto-electric apparatus for med-, ical or other purposes, and suchimprovements are intended by us to make such instruments more permanentin the parts so used and less liable to injury by inexperience oraccident, for which improvements we seek Letters Patent of the UnitedStates; and we do hereby declare that the said improvements areconstructively and substantially set forth and shown in contrastwith'the mode now mostly used for these purposesin thefollowin gdescription, and in the drawings annexed to and making part of thisspecification, wberein- Figure 1 is an elevation representing aninstrument as fitted for use with our improvements. Fig.2 is a detachedand sectional elevation of the U-form'ed magnet; and Fig. 3, a plan'withthe armature g removed, also of the U-formed electro-magnet, showing thechanges made by us; and Fig. 4 is a representation of the electro-magnetnow generally used, and this figure is so introduced and separatelyreferred to to show the difi'erences between that mode of cbustructionandours moredistinctly.

The same letters and numbers as marks of reference apply to the likeparts in the first three figures.

Ais the base-board, with the binding screwcup a at'each angle, and withthe double helix Band wire bar, all made as usual so far.

e e are 'two pillars, with e, a cross-piece,-

through which is the adjusting-screw 1, having a's'et-nnt, 2, above it.

f is. the U-formed magnet, made externally in the usual manner, andfitted with the coils of conducting-wire leading to the helixand bindingscrew-cups, as now practiced.

At one upper end of the U-magnet is a brass conducting-joint, 3,receiving one end of g, an

entire small metal bar, shown as of iron, but may be of any other metal,forming the armature, This has. below the screw-point 1 a platinaguard-plate, as usual, and on the opposite end to the'joint an iron pinor'stud, m, which enters the top of the portion of the U magnetbelow-this end of the armature. This part of the U is bored out to forma hollow cylinder, which receives a small slightly-expansive anddelicately-adjusted helical spring, 4. (See Figs. 2 and 3.) This may beeither insulated by windingwith'cotton thread, as usual, or not,'but isonly to have just power enough to raise the armature from the magnetwhen the circuit of the electric current is to act complete.

In Fig. 4 the common eIectro-magnet b is shown as having above it thearmature 0. set on asmall slightly retractile spring, 5, beneath theadjusting-screw and set-nut 6, which is set through the cross-piece 7 ofthe pillars d d as now made. When thus constructed the spring 5 isliable to injury or breakage by accident, inadvertence, or inexperiencedhands forcing it too much by the set-screw above, and any accidentfromthese causes renders that part useless. No such-liability to injuryexists in our mode of fitting the armature g as an entire bar, and l thereturning helical spring 4 is so shut up and protected within thecylinder formed in that part of the u magnet that only willful injurycan arise to that part of the apparatus;

TA pin carrying an expansive helical spring, with or without aninclosing tube or cylinder, may be placed to act from below between thetwo parts of the U-magnet to raise the armature, or any form of springmay be so used outside the U-magnet; but all forms of exterior springsfor this purpose are liable to the injury .we seek to prevent by themode of construction we have adoptcdand have herein despribed and shown.

We are aware thata contractile helical spring has been applied beneath alever to detach the armature used in the eIectro-magnetic' telegraph forregistering'or marking; but we do not know any instancein which anexpansive helical spring has been employed in direct contact with thearmature itself for the same pnr 7 pose in the magneto-electricapparatusfor med ical or other purposes, nor any in which the same effects areproduced by a spring inclosed and protected in the manner we havedescribed and shown.

We therefore claim as new and of our invention and desire'to secureby'Letters of the United States- The application of the helicalexpansive spring 4, cnnjointly with the stud or pin av, acting withinone part of the U'formed magnet f, or in any analogous or substantiallysimilar manner, for the purposes above set forth and shown.

In witness whereof we have respectively set our signatures on the datesshown as below in the presence of the w nes es subscribing hereto.

Signed by GEORGE H. HORN, in the city of Boston, the 11th day of July,1847.

v GEO. H. HORN.

Witnessesr R. HvEDDY, SILAS STEVENS.

Signed by BENJAMIN H. HORN, in the city of New York, this 8th day ofJuly, 1847.

BENJAMIN H. HORN. Witnesses: I

W. SERBELL, LEMUEL W. SERRELL.

